Differential locking-gearing.



E. LUUKWILL. DIFFERENTIAL LOCKING GEARING. APPLIUATION'HLED 0612.28, 1909.

Patented Apr. 12, 1910. v

we HMM UNTED STATES TENT FFQE,

EDWIN LUCKWILL, OF CARDIFF, ENGLAND.

TFFERENTIAL LOCKING-GEARING. i

Specification of Letters Patent.

VPatented Apr. 12. 1910.

Application filed October 2S, 1909. Serial No. 525.120.

To all whom it may concern.'

Be it known that I, Enwix LncnwiLL,

residing at T3 Broadway, Roath, Cardiff.,y

able others skilled in the art to which it l appertains to make and use the saine.

This invention relates to Improvements in road vehicles, the object being to provide improved and more ellicient means .vhereby the live axles of the diti'crential gcaringf may be locked so as to rotate in unison when desired, as for instance, when the vehicle i .brake is applied whileliassing over a greasy surface, in order to minimize the risk ofA side-slip or skidding due to the ditl'erential gearing' being inadvertently brought into action,.as is well understood. It has previously been proposed 'to attain this end in connection with the diti'erential gearing of a traction engine by employing a brake band furnished with projections designed to enter recesses in the bevel pinions to prevent their independent rotation, such -band being operated by a lever, but the present invention consists essentially' in providingl frietional Contact surfaces by means of which the said pinions are locked, and in order that the invention may be more fully understood, it will now be described with reference to the accoinlntnying drawings, in which Figure l is a half sectional elevation of a dill'crential gearing constructedV according to this invention, Fig. 2 is a half sectional plan thereof, and Fig. 3 is a longitudinal section through one of the cani-mechanisms drawn to a larger scale. Fig. 4 is adetail of a portion of the operatiiig-ring. Fig. 5 is a detail side view of one of the canimechanisms. v

As shown in the drawings, the live axles u, u, carry bevel pinious b, of the satellite gears in the usual manner, these pinions o meshing with four pinions c carried upon spindles rl radiating l'roni a"conunon center and revolving bodily' with and carried by the casing and thtl crown-wheel c, the teeth ot' which wheel mesh with the teeth of the driving pinion which is secured on the driving-shaft. lach spindle d is formed with a conical part dl against whichV the correspondingly shaped internal surface of the pinion f: bears and the space between the pinion w and a nut f/ at the oppositeextrcniity of the spindle l] is occupied by tivo o0 sleeves or collars 71, 2, (shown in enlarged detail in Fig. 3), formed with juxtaposed cam faces as shown in Fig. 1, the sleeve or collar /L having a crank or arm t engaging a slot il in a loose band y (Fig. 4) passing 65 around the satellite gear casiniy /tf and the l and connected with ditferential gearing for 1 sleeve or collar 2', a kevway 'il in the sleeve or collar being engaged by a key or feather (Z2 carried by the spindle d. Concentric with the band is the strap Z of the band brake pivoted as at m (Fig. l) and as at m to a bell crank lever nV connected to a rod nl operated by a foot pedal or the like.

The operation of the device is as follows In ordinary practice, the gearing is to all intents and purposes, the usual differential gearing, but when desired, as hereinbeforc described, upon the application of the brake ,strap l to the band j. rotation is checked which hasl the etl'ect of partially 80 turning the sleeve or collar 71, thuseausing the sleeve or collar z' to slide upon the spindle d and jam the conical surfaces of the pinion c' and spindle d together, thus eti'ectnally locking the pinion c and necessitating the axles a, a, continuing to revolve together in the saine direction. The gears are unlocked either by the thrust or by a suitable spring or springs, while it is preferred to provide an inspection cover 0 to the differential gear- 90v ing casing y) as shown in Fig. 1.

[t is obvious that the details of construction of this device may he varied considerably without departing from the spirit of this invention, the essential feature of which consists of the temporary locking of the planet pinions Yby means of frictional sur# faces.

Having 110W described my invention, what I claim as new and desire to secure by Letters Patent is:-

l. The combination, with a differential gearing comprising gear\vheels and pinions operatively connected together, a revoluble casing or spider supporting the said parts, and non-revoluble shafts mounted in the said pinions, said sha-fts and pinions being provided with opposed friction clutch-meinbers; of cams carried by the said shafts andl provided with projecting arms and ,adapted to operate the friction clutch-members to lock the saidhmalarthe 'said shafts, and

ential gearing and operatively connected look the said pinions to the said Shafts, and with the said arms. an opeiating Ting mounted to osciilate on 2. The Combination, with a differential 'the Said casing or Spider and opeziiveiy gearing comprising gear-Wheeis und pinions connected with the Said arms. operatively connected together, :i ievoiubie In tesiinonv whereof aix my' sigfnaej casing or spiceil) 1supporfting the sadid pars, in presence oi' tivo Witnesses. and non-revou e sha is mounte in tie YT T v -V- said pi11ions,'sa.id shafi's andy pinons being EDR H" LUL/K1 MJL' provided with opposed friction dutch-mem bers; of cams carried by the said Shafts and provided with `projecting arms and adapted an operating ring encircling the said differ- No operate i the friction @Mich-members to l i Y /Titnesses: u

GREGOR, Jur., ALBERT S. PHXLLLPS. 

